The rest either broke down because of the heat or lost their strength because the surface of the foil couldn't hold enough of a dosage.

FORBES: Puff Daddy

The amount of charge that can be stored depends on the surface area of the electrodes, the strength and composition of the insulation between them, and how close they are together.

ECONOMIST: Electricity storage

This massively increases their surface area and hence the charge they can hold, but without impairing the physical strength of the material.

ECONOMIST: Carbon-composite batteries

By using lightweight aerospace materials like carbon fiber, which has the strength of steel but weighs a fifth as much, naval architects can design boats that plane across the surface of the water instead of plowing through it.

FORBES: Mine's Lighter